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Re: [Linux-cluster] gfs2 v. zfs?



On Wed, Jan 26, 2011 at 8:36 AM, Gordan Bobic <gordan bobich net> wrote:
> Wendy Cheng wrote:
>
>> GFS2 fragments very soon and very badly ! Its blocks are all over the
>> device due to the nature of how the resource group works. That slows down
>> *every* thing, particularly for backup applications. A production deployment
>> will encounter this issue very soon and they'll find the issue more than
>> annoying.
>
> While I don't disagree that it's a problem, most people will use GFS and
> similar FS-es on a SAN. A typical SAN will allocate sparse files for backing
> the block device. That means it'll be badly fragmented very quickly on the
> back end regardless of what the FS does.

I don't know how a "typical SAN" is defined ... but I could guess
which SAN box does this. Did you check their admin guide ? You may be
surprised by the turning knobs they offer.

-- Wendy

>
> Gordan
>
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